Toshiba MMD-AP0071SH-C Service Manual page 103

Check code name Check code name
[P15] / [AE] Gas leak detection
(d07 / AI-NET)
TD condition (Sub-code: 02)
NO
Are service valves of gas
and liquid sides fully opened?
YES
Is outdoor PMV1, 2 normal?
1. Connector connection
NO
2. Cabling
3. Coil
Connectors CN300, 301 White
4. Valve body
5. Outdoor I/F P.C. board
YES
NO
Are characteristics of
TD1, TD2 sensor resistance normal?
Refer to outdoor unit temperature
sensor characteristics-4.
YES
NO
Is SV4 valve circuit normal?
(Coil misinstallation, valve leakage)
YES
NO
Are not indoor units in different
refrigerant circuit connected?
( Check with miscabling check
function of outdoor unit.
YES
Abnormal
Check leakage of
SV5 and SV11 circuits.
Normal
Abnormal
Check mispiping of discharge gas/
suction gas main pipes.
Normal
Abnormal
Is the flow selector unit normal?
Normal
Refrigerant shortage,
(Check there is no clogging and pipe breakage, and then recharge refrigerant.)
clogging, pipe breakage.
Cause of operation
1. Outdoor unit service valve closed
2. Outdoor PMV error
3. TD sensor error
4. SV4 circuit error
5. Refrigerant shortage, clogging refrigerant
circuit
Open service valves fully.
Repair outdoor PMV.
Replace TD1 or TD2 sensor.
Repair SV41 and SV42 circuits.
( Coil, valve body, coil installation, )
disconnection of cable, etc.
Correct cabling.
)
Replace defective parts.
Correct piping.
Repair the flow selector unit.
Check code name Check code name
[P17] / [bb] Discharge temp TD2 error
(d07 / AI-NET)
NO
Are service valves of gas and
liquid sides fully opened?
YES
Is outdoor PMV normal?
1. Connector connection
NO
2. Cabling
3. Coil
* Connectors CN300, 301 White
4. Valve body
5. Outdoor I/F P.C. board
YES
NO
Are characteristics of
TD2 sensor resistance normal?
* Refer to outdoor unit
temperature sensor
YES
characteristics-4.
NO
Does not discharge refrigerant gas by
pass to suction sidethrough 4-way valve?
YES
SV4 circuit
1. Are not SV41 and SV42 valve NO
coils installed reversely?
2. Is there no leakage through
SV42 circuit?
YES
NO
Check leakage of SV5 circuit.
YES
NO
Check clogging of SV6 circuit.
YES
NO
Check mispiping of discharge gas/
suction gas main pipes.
YES
NO
Is the flow selector unit normal?
YES
NO
Is not an indoor unit of different
refrigerant line connected?
( Check with miscabling check
function of outdoor unit.
YES
Refrigerant shortage, clogging, pipe breakage.
(Check there is no pipe breakage, and then recharge refrigerant.)
Cause of operation
1. Outdoor unit service valve closed
2. Outdoor PMV error
3. TD sensor error
4. Refrigerant shortage, clogging of refrigerant circuit
5. 4-way valve error
6. SV4 circuit leakage, misinstallation
7. SV5 circuit leakage
8. SV6 circuit clogging
9. Mispiping of discharge gas/suction gas pipes
10. Flow selector unit error
Open service valves fully.
Repair outdoor PMV.
Replace TD2 sensor.
Check 4-way valve.
Correct installation of valve coil.
Replace SV42 valve.
Replace defective parts.
Replace defective parts.
Correct piping.
Repair the flow selector unit.
Correct cabling.
)